Random head jerking that won't stop

I been experiencing this weird sention for months now where my head randomly jerks. I could be standing up straight and then all of a sudden I have issues standing up and then all of a sudden it feels like I am being crushed downward and my legs are also being crushed downward too. When I am laying down I notice it even more it feels like a in and out contraction. I like to be a rock star somtimes and jerk my head up and down alot to when I like tk listen to a favorite song could this be a muscle stress and the muscle in my neck is just involuntarily moving?